Looper mechanism for shoe-sewing machines



F. E. VLOIS.-

LOOPEH MECHANISM FOR SHOE SEWING MACHINES. APPLicATloN FILED IAUG. 1. 191s.

21,43%997; mantenne 20, 1922.

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` F. E. VALOIS. LOOPER MECHANISM FOR SHOE SEWING MACHINES.

APPLlcATloN FILED AUG. l, |918.

L41 999'Z y Patented June 20,1922.

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rn'LIx EMILE vALoIS, or HAvnnHILL, MASSACHUSETTS, ASSIeNon. To HAMEL anon MACHINERY COMPANY, or LYNN, MASSACHUSETTS, A ConroRATIon or MASSA CHUSETTS.

Loornn, MEGHANISM ron SHOE-Sammie MACHINES.

Specication of Letters Patent. Patentggd Jun@ 2Q? 1922 Application filed August 1, 1918. Serial No. 247,750.

. chusetts have invented a. certain new and useful improvement in Looper Mechanism for Shoe-Sewing Machines, of which the following is' a specification, reference being had therein to the accompanying drawings.

-My invention relates to looper mechanism for sewing machines particularly intended for use in the manutacture jbf boots' andy shoes. The particular object of the invention is to rovide a looper operating mechanism whicii shall not contain any cams, and which at the same time shall give to the looper a path of movement which will make the looper effective in performing its functions. ln the machine shown in the accompanying drawings, eccentrics are employed to operate the looper. rlhis makes it possible to run the machine at much hi her speed without noise or jar. ln the hereinafter de-y scribed mechanism the looper is on the end of a bodily movable looper bar and the looper may be considered to have a movement separable into two components, one of which is lengthwiseof the looper bar and the other is transversely to it. When con sidered in this manner, the lengthwise movement is given to the looper by one eccentric while the transverse movement is given to it in part by both eccentrics, but mainly by the second. The twol eccentrics are driven by suitable gearing which causes the eccentric which moves the loo er bar longitudinally to make tworevolutions for each revolution of the other eccentric. The arrangement described not only permits the use of eccentrics insteadnof cams but gives to the looper the proper motion for cooperatingl with the other stitch forming instrumentalities, and does away with a looper bar having a long unsupported portion. This is a great advantage in 'a machine to be run at high speed, since a long looper bar springs and causes a deviation of the looper from the predetermined path of movement as well as produces vibration.

My looper operating mechanism also keeps the looper close to the line of thread extendingfrom the work support to the take up during the portion of t e cycle of movement of the machine in which the take up is drawing down the thread so that the thread renders easlly4P and without undue strain; and further the path of movement of the looper 1s Such that the looper is kept well away from the upper of the Shoe.

The invention will be fully understood -from the following description when taken in connection with the accompanying draw- 1n s and the novel features thereof will be pointed out and clearly defined in the claims at the close of this s ecification..

In the drawings7 ig. 1 is a vertical sectiorn of a portion of a sewing machine embogying the invention.

ig. 2 is a fro-nt elevation shown in F ig. l.

Fig. .3 is a top view ofthe looper bar and eccentrics.

Fig. 4 is a diagram showin the path of movement of the looper re ative to the needle.

Referring now to the drawings, at A, is shown the frame of the machine. At B is shown a. needle carried by a needle sector C and actuated by a link D, connecting rod E,

of the parts a crank F and a link G. These parts do not` require to be described in detail herein. These parts give to the needle an oscillatory movement about a. centre H, the movements being timed to cooperate effectively with the other Stitching instrumentalities. At I is shown the work support or table.

At 11 is shown a looper adjustably mounted in the end of a looper bar 12. The end of the looper bar 12 whichl is away from the looper 11 is formed into an eccentric strap 13 engaging the eccentric 14 mounted on a shaft 15 in the frame of the machine. This eccentric 14 moves the looper bar longitudinally and also cooperates in giving the looper its transverse movement. The transverse movement of the looper is chieiy effectedby an eccentric 16 mounted on a shaft 17 which is parallel with. the shaft 15. The

-21 and the cross shaftcarries a bevel gear 24 which meshes with the bevel gear 25 on the eccentric shaft 15. The master gear 21 and the bevel gear 22 have a ratio of two to one while the gears 24 and 25 are of equal size so that the eccentric shaft 15 makes two revolutions for each revolution of the master gear 21. On the side of the master gear 21 opposite to the bevel gear 22 is located another bevel gear 26 which is of the same size as the bevel gear 22. The gear 26'is mounted on a cross shaft 27 on which is a spiral gear 28 meshing with a spiral gear 29 on the eccentric s aft 17. he spiral gears 28 and 29 are designed so that the eocentric shaft 17 makes one revolution for every two revolutions `of the eccentric ,shaft 15.`Y

From the foregoing it will be seen that the looper bar is given two longitudinal movements for each transverse movement. rlhis produces a peculiar movement of the looper in a closed "path or orbit having areentrant loolp.

he path of movement ofl the looper has been plotted in Fig. 1Lof the drawings, and the position which the looper occupies at the end of each Ll5 degree movement of the master gear has been indicated, successive positions being serially numbered. The feed of the work is in the direction of the large arrow in Fig. 4 and looper travels in the direction indicated by .the small arrow.

The position marked 8 is the position occupied by the looper when the needle is near the top of its stroke. The needle goes down at about thea position marked 2 and the looper in moving around the curve 2, 3, 4 lays the thread in the barb of the needle. As the needle-loop is being passed around the shuttle, the looper is projected forwardly so that at the time the take-up action occurs,"

the looper is rounding the end of the reentrant loop at the point 6 and, in rounding the end of such loop is maintained substantially in line with the lead of the thread from the work to the take-up, during the take-up action. At the completion of the take-up action the looper is withdrawn to the position 8 to get it out of the way of the advancing awl.

The mechanism described may be run at very high speed as the two eccentrics'give to the looper an easy motion and at the same maintain the looper in the positions relative to the needle best calculated for the rapid formation of the stitch.

What I claim is:

1. A sewingmachine having, in combination, a hooked needle, a take-up, a loo er at the same side of the work as the ta {e-up, and eccentric means for moving said looper in a closed path having a reentrant loop, ulstantially as and for the purposes speci- 2. A sewing machine having, in combination, a hooked needle, a .take-up, a looper at the same side of the Work as the take-up,

andmeans comprising a plurality of eccentrics for moving said ooper in a closed path having a reentrant loop, substantially as and for the pur oses speclfied.

3. In com ination, a looper, a looper bar, means to move the looper bar longitudinally, means to move the looper bar transversely said means being timed so that the looper bar is given twice as may longitudinal movements as transverse movements.

4. In combination, a needle, needle actuating mechanism, a looper, alooper bar, means to move the looper bar longitudinally, means to move the looper bar transversely, said "means being timed so that for each complete cycle of movement of the needle, the looper bar will be given two complete longitudinal movements and one complete transverse movement, and the looper will travel in a closed path having a reentrant loop which includes the needle within its limits.

5. In combination, a needle, needle actuating means, a looper, a looper bar, means to move the loopei' bar in a line parallel to the plane of movement of the needle, means to move thelooper bar in a plane substantially at right angles to the plane of movement of the needle, said means being timed so that the looper bar will make two movements parallel tothe plane of the needle and one movement in the plane at right angles for each cycle of the needle, and the looper will travel in a closed path having a reentrant loop at right angles to the plane of the needle.

6. In combination a looper, a looper bar, a rotary member to give the looper bar a longitudinal movement, and a rotary member to give the looper bar a transverse movement7 said membegs being timed to give two longitudinal movements Vto the .looper bar for each transverse movement thereof.

7. In combination, a looper, a looper bar,

and two eccentrics to actuate said looper bar,

one of said eccentrics being connected to said looper bar at the end away from the looper and giving to the looper bar a longitudinal movement and the other eccentric acting on said looper bar at a point intermediate the looper and the first. mentioned eccentric.

8. In combination, a looper, a looper bar, and two eccentrics to actuate said looper bar, one of saideccentrics being connected to said looper bar at the end away from the looper and giving to the looper bar a longitudinal movement and the other eccentric acting on said looper bar at a point intermediate the looper and the first mentioned eccentric, said eccentrics being timed so that the second .mentioned eccentric will make one revolumiese? strap therefor connected to the looper bar at a point intermediate the ends of the looper bar.

10. In combination, a 'looper, a looper bar, an eccentric connected to said looper bar at the end away'from the looper, a second eccentric, and an eccentric strap therefor connected to the looper bar at a point intermediate the ends of the looper bar, said eccentrics being timed so that the lastl mentioned eccentric will make one revolution for each two revolutions of the first eccentric.

11. In combination,'a looper, a looper bar, an eccentric, an eccentric strap rigidly connected to that end of the looper bar which is at a distance'from the looper so that the eccentric both swings the looper bar and acts as a pivot, a second eccentric, an eccen 4tric strap therefor, said stra being connected to the looper bar at a polnt intermediate its ends, so that it swings the looper bar about the first eccentric as a pivot, and gives the looper a movement transverse to thatV given it by the first eccentric.

12. In combination, a looper, a looper bar, an eccentric connectedfto said looperv bar at the end away fromthelooper, a second eccentric acting on the looper bar ata point intermediate its ends, `shafts for said eccentrics, and gearing actuating said shafts so that one eccentric makes two revolutions to each revolution of the other eccentric.

13.111 combination, a looper, a looper bar,

any eccentric connected to said looper bar at the end away from-,the looper, a second eccentric acting on the looper bar at a pointl of the hooked end of the needle when the latter is in loop-receiving'position, mechanism including an actuating eccentric for moving the looper bar endwise and sidewise to lay a loop of thread in the hook of the needle, said mechanism beingconstructed and arranged to move the looper in time with the other stitch-forming instrumentalities in a closed curve path. i

`15. A sewing machine having; in combination, stitch-forming mechanism including a hooked needle, a looper, a plurality of eccentrics connected to run at different speeds, and operative connections between said eccentrics and looper for moving the latter in a closed path.

In testimony whereof I aiix my signature.

LDMiLE vALors. 

